Figure 8-8.Diagonal brace angles
windows, as these procedures will vary with available
Sheeting, both sidewall and roof, must always be
started at the end of the building toward which the
prevailing winds blow. This action will ensure that the
exterior joint in the side laps is away from the blowing
of the prevailing winds. When installing roof sheeting,
always use a generous amount of mastic on the upper
side of all roof sheets just before moving them to the
roof. Turn the sheet over and put a bead of mastic on
the lip of one side of the corrugation and along one
end (near the end but never more than one 1 inch from
the end). Be sure to apply a horizontal bead of mastic
between aIl sheets in the end laps, BELOW THE LAP
HOLES. The roof sheets must be dry when mastic is
applied. Mastic is extremely important, and care
should be exercised whenever applying it to ensure a
watertight seal. Apply generous beads, especially at
the comers of the sheets. Finally, the ridge cap will be
installed ensuring proper watershed. As previous] y
stated, the information in this manual is general
information common to pre-engineered buildings.
The pre-engineered building can be insulated by
any of several methods. A blanket type of insulation,
in 2-foot-wide strips, to match the width of the roof
and wall sheets can be installed between the sheets and
structural at the same time the sheeting is installed.
Or, a hardboard insulation can be applied directly to
the inside surface of the structural, attaching it by
helix nails or by sheet-metaI screws in holes prepared
by drilling of the structural. Or, a wood framing can
be prepared, attached to the structural, and a
hardboard insulation is nailed to the wood.
Buildings Set Side by Side In Multiples
Pre-engineered buildings can easily be set upside
by side to increase the working area under one roof.
When this is done, the adjacent rigid frames should be
bolted back to back with a channel spacer at each girt
location (fig. 8-9).
The cave struts are moved up the roof beam to the
second set of 11/16-inch-diameter holes to provide a
gutter. This arrangement provides a space between
cave struts of 13 1/2 inches. A field-fabricated gutter
can be installed.
Flat, unpainted galvanized steel of 24-to 26-gauge
material should be used for the gutter. A depth of 6 1/4
inches is desirable with the downspouts located as
required. Gutter ends should be lapped at least 6 inches
and should be braze-welded for watertightness. Note
that wall sheets can be used to form a gutter if the
outside corrugations are flattened and all of the end
laps are braze-welded.
Roof sheets must be cut shorter where they
overhang the gutter. The corrugations can be closed
with the continuous rubber closure with mastic
applied to the top and bottom surfaces of the closure.
An alternate method is to flatten the corrugations at
the gutter and seal them with a glass fabric stripping
set in plastic.